ArmaLaser Beretta PX4 Storm FS GTO Red Laser and FLX37 Grip Switch Extremely bright 635nm Red Laser with grip activation. Just grasp pistol normally to turn laser on. Custom fit FLX37 ultra thin remote touch sensor switch for Beretta Px4 Storm Full Size included. Uses human touch technology to turn on, no mechanical switch or push button or holster activation. Adjustable laser, battery door, master kill switch. Made from DuPont Zytel polymer pistol material. Designed, assembled in Florida, USA. Patented. Ultra reliable electronics. Simple installation.